.257 Roberts (Ruger Model 77) Load Data

21 published .257 Roberts (Ruger Model 77) reloading recipes across 4 powders and 2 bullet manufacturers, with bullet weights from 75 to 117 grains and recorded velocities between 2,860 and 3,455 fps. Every load lists charge weight, velocity, COAL, primer and case where the source published it.

Always begin at the minimum charge weight and work up gradually. Never exceed maximum loads. Verify all data against a current published reloading manual before use. LoadDevelopment.com is not responsible for errors or omissions in this data.
Recipes
21
Powders
4
Bullet makers
2
Bullet weights
75–117 gr

Sample .257 Roberts (Ruger Model 77) loads

The first 5 of 21 recipes.

BulletPowderChargeVelocityCOALPrimer
Speer Speer 100grIMR IMR-435048.0 gr3,185 fps—CCI 200
Sierra Sierra 100grIMR IMR-435047.0 gr3,132 fps—CCI 200
Sierra Sierra 100grIMR IMR-483149.0 gr3,203 fps—CCI 200
Speer Speer 100grIMR IMR-483149.0 gr3,134 fps—CCI 200
Sierra Sierra 100grAccurate MR-310050.0 gr3,035 fps—CCI 200

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